Accurately determine the stoichiometric and actual air-fuel ratio (AFR) for your combustion processes. This calculator helps engineers, students, and technicians optimize fuel efficiency, minimize emissions, and design efficient combustion systems based on fuel elemental composition.
Formula:
The Air-Fuel Ratio (AFR) is determined by balancing the moles of oxygen required for complete combustion of the fuel's elemental components (Carbon, Hydrogen, Sulfur) against the oxygen available in the supplied air, accounting for any oxygen already present in the fuel itself. The general principle for stoichiometric AFR (mass basis) is:
AFRs = (Mass of Air) / (Mass of Fuel)
Where:
- Mass of Air: Calculated from the total oxygen required for complete combustion, divided by the mass fraction of oxygen in dry air (typically 0.232).
- Mass of Fuel: The input fuel mass (e.g., 1 kg).
- Oxygen Required: Sum of oxygen needed for C→CO2, H→H2O, S→SO2, less any oxygen present in the fuel.
This calculator uses the elemental mass percentages of Carbon, Hydrogen, Oxygen, Nitrogen, and Sulfur to determine the precise air requirements.